Exorcist II: the Heretic. Poster of the 1977 movie and cover of the 1971 book, The Exorcist
VS3
The Exorcist
William Peter Blatty, 1971
movie vs book
John Boorman, 1977

Regan MacNeil is tormented by strange and unsettling nightmares four years after her possession and exorcism. The question arises: has the malevolent demon returned to haunt her once again? To confront this sinister presence, a Vatican investigator and a research specialist join forces, combining their faith and knowledge in a desperate attempt to free Regan from the demon’s relentless grip.